The switching relay model AR 822 DPDT-Argon won't turn the boiler on.

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Elsiervo178

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Location
Brookline MA
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Maintenance technician
I have a burnham boiler series 2 hydronic hot water.

There is 2 circulator pump. 3Thermostat, 2 zone valve taco.
One board inside the boiler. The other opposite side outside the boiler.

2nd floor
One supply the heat for the kitchen and living room. There is 2 zone valve taco 3 wires , 2 thermostat for this floor (2nd) . This floor is control by a switching relay DPDT. Model AR 822- Argon.
That is located on the outside part of the boiler.

I can't get the boiler to turn on.
Neither the relay will close. Neither the zone valve will open or the circulator pump running.
I replaced both thermostat kitchen and living room
Still nothing happen.

3rd floor
The other circulator pump supply hot water for the heater in the bedroom at the 3rd floor. Have not zone
valve.
3rd floor have it on thermostat. Going to the squastast board inside the boiler
This one turn the boiler on.without no problem.

When the boiler was running.
I put the zone valve on manual and apply power to the circulator pump.
Then heat was coming out to the heater on the 2nd floor.

What is wrong at the 2nd floor.
 
Last edited:
Before you focus on controls, you need to be sure the loop has at least 12 PSIG at the highest point and no entrained air. You then need to break things down by sequence of operation, and focus on one aspect at a time so you are not overwhelmed. If the boiler will not start on call for heat, you need to look at interlocks outboard that might prevent it. If you can break things down into sections and solve one at a time it becomes easier.
The question about new or existing is critical. Unfortunately, there are a major lot of systems at large that are not or were never set up correctly and this typeystem can be very challenging. Sometimes moreso that a multi story closed loop.
 
StarCat said:
Before you focus on controls, you need to be sure the loop has at least 12 PSIG at the highest point and no entrained air. You then need to break things down by sequence of operation, and focus on one aspect at a time so you are not overwhelmed. If the boiler will not start on call for heat, you need to look at interlocks outboard that might prevent it. If you can break things down into sections and solve one at a time it becomes easier.
The question about new or existing is critical. Unfortunately, there are a major lot of systems at large that are not or were never set up correctly and this typeystem can be very challenging. Sometimes moreso that a multi story closed loop.
Click to expand...
Thank you.
I did the check for 12psig at the expansion tank And the and the purge valve and the top of the expansion tank is working.

I check the gauge inside the boiler on y right side of the squastast board, and have 25 psig
The siwthch relay AR 822 have the power supply 120volts. Is live.
 
Elsiervo178 said:
Thank you.
I did the check for 12psig at the expansion tank And the and the purge valve and the top of the expansion tank is working.

I check the gauge inside the boiler on y right side of the squastast board, and have 25 psig
The siwthch relay AR 822 have the power supply 120volts. Is live.
Click to expand...
Is there another component that need to be check for the loop pressure.?
 
Elsiervo178 said:
Used to work , the weird things is both thermostat click for on And off.
Can I jump the thermostat at the board to see if there is a wire problem
Click to expand...
I am limited to smaller systems than what you have and it is not what I do every day. I wanted to get the main question out of the way.

Go back up to StarCats post and do as he suggests. Jumping the stat would get that part out of the way.
 
Elsiervo178 said:
Thank you.
I did the check for 12psig at the expansion tank And the and the purge valve and the top of the expansion tank is working.

I check the gauge inside the boiler on y right side of the squastast board, and have 25 psig
The siwthch relay AR 822 have the power supply 120volts. Is live.
Click to expand...
Also the same gauge inside the boiler show the pressure at 12 psig. While the boiler is running.
 
What's the pressure got to do with the zone valves not opening or the thermostats not working???

Elsievro, take the cover off that Argo control, check for 24V between C and R. Check for 120V between L1 and L2. Let us know.

-Hal
 
Thank I like you answer is seeing that is more an electrical problem than other.
There is 120 volt at L1 and L2
The 24 v. C R coming from the output of the steps down transformer or at the TT terminal. Show at the top of the board in the picture.
 

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Elsiervo178 said:
Thank I like you answer is seeing that is more an electrical problem than other.
There is 120 volt at L1 and L2
The 24 v. C R coming from the output of the steps down transformer or at the TT terminal. Show at the top of the board in the picture.
Click to expand...

This are the other picture.
 

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Are you sure that Argo relay box is not controlling the circulator for the 3rd floor that doesn't have zone valves instead of the 2nd floor?
I think the Taco 3-wire zone valves would need the C terminal (common) connected to them, and your picture appears to show the C terminal without a wire.
 
synchro said:
Are you sure that Argo relay box is not controlling the circulator for the 3rd floor that doesn't have zone valves instead of the 2nd floor?
I think the Taco 3-wire zone valves would need the C terminal (common) connected to them, and your picture appears to show the C terminal without a wire.
Click to expand...
If it has been working, why look at the wiring now?
 
StarCat said:
Before you focus on controls, you need to be sure the loop has at least 12 PSIG at the highest point and no entrained air. You then need to break things down by sequence of operation, and focus on one aspect at a time so you are not overwhelmed. If the boiler will not start on call for heat, you need to look at interlocks outboard that might prevent it. If you can break things down into sections and solve one at a time it becomes easier.
The question about new or existing is critical. Unfortunately, there are a major lot of systems at large that are not or were never set up correctly and this typeystem can be very challenging. Sometimes moreso that a multi story closed loop.
Click to expand...
Hello starcat. Thanks for the advice.

I Figure out . Just as you said, by breaking things down.
This is the thing. Thermostat send the signal to the zone valve. I have a reading of 24v. Between 1&2 terminal ( 3 wires taco 571-2).
Now the end switch doesn't engaged. And the switch relay box is
 
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